APPARATUS AND METHOD FOR CHANNEL ESTIMATION IN SDMA-OFDM SYSTEMS

摘要

A smart antenna for use of OFDM (Orthogonal Frequency Division Multiplexing) system, the channel estimator to about as the received signal to a fast Fourier transform to the frequency domain of the signal is converted to FFT (Fast Fourier Transform), and the FFT from the service received frequency domain signals of, SDMA (Space Division Multiplexing Access) users to the assigned area of ​​the preamble (preamble) for use by the first channel information for estimating a channel acquisition group, and the FFT from the service received frequency-domain signals of the SDMA users assigned pilot of the data area (pilot) and the channel tracker to estimate the second channel information by using them, by applying a weight according to a channel variation rate in the first channel information and the second channel information includes a channel estimator for estimating a final channel information by, and to improve the channel estimation performance, thereby there is an advantage capable of improving the gain of the smart antenna technology. ; Smart antenna, AAS preamble, a pilot, channel estimation, OFDM system,